#include <string>
#include <iostream>

using namespace std;

std::string myfunc(std::string input){
    std::string b;

    // if (!input.size()) return 0;
    for (int i = 0; i < input.size(); i++){

        if ( input[i] < 'a' || input[i] > 'z'|| isalpha(input[i]) || isupper(input[i]) ) return b;
    }
    b = input;
    //just copy the input string for now.
    return "ee";
}

int main(){
    std::string input="Somthing";
    std::cout << myfunc(input)<< std::endl;
    return  0;
}